Bitfinex API for Google Apps Script

Gists This sample script is converted this sample script (javascript) to Google Apps Script. The point for converting is signature as shown in the following sample script. At Bitfinex API, after "/api/" + apiPath + nonce + rawBody is encrypted using HMAC SHA-384, the data of byte array is converted to HEX. In Google Apps Script, there is no the method for this. The data which was encrypted by Utilities.